Implement more sceNet and sceHttp stubs.

List includes:
sceNetApctlAddHandler
sceNetApctlDelHandler
sceNetApctlInit
sceNetApctlTerm
sceNetInetInit
sceNetInetTerm
sceHttpInit
sceHttpEnd
Fix typo in __UpdateAdhocctlHandlers and remove stray carriage return.
Merge pull request #2365 from thedax/sceNetAndHttpStubs

Implement more sceNet and sceHttp stubs